Connect to a 5V USB power source; allow battery to charge for a full 4-hour cycle.

The button alters the digital filter width. Choosing the correct width isolates weak signals from background noise.

: Attach the rubber feet for stability, screw the telescopic antenna into the "ANT" port, and charge via the USB Type-C port until the LED indicator changes.

Toggle the physical slide switch on the top or side pane to the position.

Controls how the radio handles shifting signal strengths. 3. Essential Operating Guide

Displays the current tuning increment (e.g., 1kHz, 5kHz, 9kHz, 100kHz).

Press the button. A secondary offset indicator (usually in Hz) will appear or flash on the display.

Use a simple clip-on wire antenna. Clip it to the telescopic whip and run it outside or near a window to significantly reduce "noise floor" interference. 3. Mastering the Bandwidth (BW)

Switches the modulation type. Pressing this cycles through AM, USB, LSB, and WFM.

Turn the physical volume/power knob clockwise. The OLED screen will light up, displaying the current frequency and firmware version.

Multi-function clickable dial used for frequency tuning and menu navigation. The Five Key Tactile Buttons

Shows current demodulation (FM, AM, USB, LSB).

The ATS-20 expects a 50-Ohm input impedance. A long-wire antenna has a high impedance (often 450+ Ohms). Introducing a 9:1 impedance matching transformer (UNUN) reduces signal loss and eliminates static buildup.

: Rotate to tune frequency; press and hold to enter menu settings like brightness or BFO (Beat Frequency Oscillator).

Cycles upward through the pre-programmed amateur and broadcast bands. Press Button 4 (Band-): Cycles downward through the bands. Changing Modulation (AM/FM/SSB)